Air-purifier



(No Model.) I

' J. S. DODGE.

AIE BURIFIER.

` No. 507,675. fina& Oct. 31, 1893.

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NITED STAT S PATENT OFFICE.

JOHN S. DODGE, OF MINNEAPOLIS, MINNESOTA.

AlR-PURIFIER.

SPECIFICATION forming part of Letters Patent No. 507,675. dated October31, 1893.

Application filed January 17,I 1893. Serial No. 458.691. (No model.)

T0 all whom it may concern:

Be it known that I, JOHN S. DODGE, a citizen of the United States,residing at Minneapolis, in the County of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inAir-Purifiers; and I do declare the following to be'a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification.

My invention has reference to improvements in devices for purifying airto be 'utillzed in the ventilation or heating of buildings, and has forits objects to arrest the dust and other floating particles from theair, and to provide means for automatically regulating the strength ofthe air currents.

To these ends my invention consists in comhm ng with the air duct orpipe through whlch the air is conducted from the outer atmosphere to theinterior of the building, a series of V-shaped cloth pockets the mouthsof which are presented to the infiowing currents of air, and arearranged to conform to the size of the said pipe to completely fill itand necessitate the passage of the air through the meshes of the clothcomposing said pockets; and the small ends of which pockets are weightedfor a purpose hereinafter described.

The construction, relative arrangement and operation of the severalparts constituting my lnvention will now be fully and clearlyascertained and described, and reference is to be had in connection withsuch description, to the accompanying drawings which form a part of thisspecification, and in which- Figure 1 represents in perspective View anair duet or pipe with one side removed showing the arrangement ofpockets; Fig. 2 a vertical central section of the same, and Fig. 3 a

similar View showing the pockets distended for regulating the blast ofair.

The reference letter A denotes the air duet which is shown rectangularin cross section and which receives the air from the outer atmosphereand carries it in the direction of the arrows to the several rooms ofthe building for ventilation, or through a suitable furnace or otherheater to the rooms for heating purposes.

b, b, denote the pockets which are formed of cloth and are V-shaped,with the upper cloth composing 'the pockets and is thoroughly filteredand freed from any dust and other floating particles, and furnished tothe building in a purified state. In the event that the current ofentering air is too strong the action of the same will cause aninflation of the pockets as in Fig. 3, and consequently a contraction ofthe same longitudinally. The sides of the pockets are thus expanded andcontact with the sides of the adjacent pocket and the sides of the duct,thus shutting off an area' of ventilation equivalent to the excess ofair pressure. When the said excess of pressure is reduced the pocketsreturn to their normal shape which is shown in Fig. 2. By reason of thisconstruction and operation a steady flow of purified air is maintainedunder the desired pressure, regardless of the condition of the enteringair.

I claim- 1. In an apparatus for purifying air the combination with anair supply duct or pipe, of a series of V-shaped pockets formed of clothor other porous fabric arranged therein and in line with said pipe, andsuspended by their upper open ends which face the incoming air currentand having their lower ends free, substantially as and for the purposespecified.

2. In an apparatus for purifying air the combination with an air supplyduet or pipe, of aseries of V-shaped pockets arranged within and in linewith said pipe and formed of cloth or other porous fabric and havingtheir fixed open upper ends facing the incoming air current and providedwith weights at their free lower ends substantially as and for thepurpose specified.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN s. DODGE.

witnesses:

CHAS. J. MARTIN, FRED G. ATKINSON.

